P97 The GRIMs shallow convection scheme

Hong, Song-You, Jihyeon Jang, Junhong Lee, Yonsei University, South Korea, Jimy Dudhia, and Wei Wang, National Center for Atmospheric Research

This study investigates the impacts of shallow convection schemes on a simulated seasonal climatology in the Global and Regional Integrated Model system (GRIMs). The eddy-diffusivity scheme of Tiedtke is evaluated, focusing on the dependency upon the deep convection schemes. Drying and warming near the top of the boundary layer and countering effects its above are observed. These effects are pronounced over the oceans, which leads to the modulation of tropical precipitation. It is found that the Tiedtke scheme shows similar effects regardless of the choice of the deep convection scheme. A revised scheme that explicitly couples the planetary boundary layer and shallow convection is proposed and evaluated. The effects of shallow convection is also investigated in the WRF model